overlay plot

Hi all, I come to you again and hope your sharing. I want to plot olr data and wind data together using overlay. The code and the input data are enclosed. By this email, I would like to ask several questions: (1). I think my attached code is correct, but when I run it was stated that "can not be overlay", how to make it overlayable ? (2). How to set the space of the Thick of X and Y axis of the plot ? For example we can set the latitude and longitude as follow:  res@mpMinLatF             = -10      ;   res@mpMaxLatF             =  10.   res@mpMinLonF             =  80.   res@mpMaxLonF             = 160. For example, if we need to set the spaceLonF = 10, how to do it ? (3) Assume we want to make multiplot as: gsn_panel(wks,plots,(/4,1/),pres), how to set the colorbar size and location ?, we can set as:   pres                  = True         ; Set panel resources.   pres@gsnPanelLabelBar = True         ; Turn on panel labelbar.   pres@lbOrientation   = "Vertical"  But the size is very large (it is very long), for example if we need the location of the colorbar is at right side of first figure and the size is the same as the size of the first figure (its height), how to do it ? Sorry, too many questions, thanks for nice attention... Cheers Juky

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